Furnace for boilers



(Model.) L

M. o. HAWLEY a1,- M. KEARNEY.'

FURNAGE PORB-OILERS.

No. 247,190. Patented Sept. 20,1881.

I LJZ UNITED STATES PATENT OFFICE.

MELVILLE O. HAWLEY, OF ST. LOUIS, AND MICHAEL KEARNEY, OF NORTHSPRINGFIELD, MISSOURI.

FURNACE FOR BOILERS.

SPECIFICATION forming part of Letters Patent No. 247,190, datedSeptember 2O, 1881.

Application nieu July 19,1ss1. (Model.)

To all whom it may concern Be it known that we, MELVILLE C. HAWLEY,residing at St. Louis, and MICHAEL KEARNEY, residing at- NorthSpringeld, Greene county,

both in the State of Missouri, citizens ot' the United States, haveinvented certain new and useful Improvements in Furnaces for Return-Flue Boilers, applicable to steam-vcssels,sta tionary engines, 811e.;and we do hereby declare 1o the following to be a full, clear, and exactdescription of the same, reference being had to the accompanyingdrawings, in which- Figure I is a side elevation, partly in section, ofa return-flue boiler and furnace embodying our invention. Fig. II is afront elevation of the boiler and furnace,partly in section.

Like letters refer to like parts wherever they occur.

Our invention relates to the construction of that class ofboilerfurnaces wherein the air for supporting combustion and the gasesgenerated pass through the incandescent fuel 5 and it has for its objectto adapt such furnaces to return-line boilers, whether marine orstationary, and especially to the'class of boilers in most common use.

To this end it consists, mainly, in the construction of the pendentpartition or watertable, tubular grate, and water-spaces inclosing there-box, and the relative arrangement and connection of the severalparts, whereby the circulation from the boiler through the water-spaces,grate-bars, and table is main- 3 5 tained, and a downward draft throughthe fuel in the fire-box is effected, all as will hereinafter more fullyappear.

We will now proceed to describe our invention more particularly, so thatothers skilled in 4o the art to which it appertains may apply the same.

In the drawings, A A indicate boilers, having return-lines a a andsuitable breechng, B. O D are the plates constituting the side walls ofthe furnace, and are connected in parallel lines to the boiler, asindicated at G D, suffi ciently far apart to form a suitable waterspaceat the sides of the furnace. From the front of the boilers, to whichthey are attached, extend 5o plates c d, passing under and around therebox, and thence curving upward, as at e, to

forni the throat of the furnace. These plates also are such distanceapart as will give the desired Water-space, and are` connected with theplates of the side walls, C D, so that a continuous water-space isformed around the firebox. In order that this front water-space maycommunicate with the boilers, openings g are made in the bottom of theboiler, at its front, near the head, and a current is thus estab 6olished from the boiler into the front waterspace. A horizontally-arra'nged series of openings, h, are formed in the sides of the boiler,between the points of attachment of the parallel plates O D, so that areturn-currentis established from the water space E into lthe boiler.

F indicates a pendent partition or water-table, upon which the lowerportion of the boilers rest, the spaces between the top of the pen- 7odent partition or water-table and the boilers and the curves between theboilers being filled with iron plates or with brick-work, as shown at f,to prevent any draft between the pendent partition or water -table andbottom of the 7 5 5 boilers. This pendent partition or water-table Fextends entirely across the tire-box, communicates with the water-spaceon each side of the furnace, and may be provided with a plug forcleaning out the sediment, 8vo.

Gr indicates the grate, composed of a series of tubular bars whichconnect at one end with the pendent partition or water-table F and atthe opposite end with the front water-space, so as to establishcommunication between the front water-space and pendent partition orWater-table. These bars are arranged sufficiently far below the boilersto give the desired fuelspace, and sufficiently far apart to admit of afree draft-space for the passage of products of 9o combustion, ashes,Snc.

U indicates the upper door, through which the fuel is introduced and thedraft admitted to the furnace; and L is the lower door, by means ofwhich access is had to the ash-pit 9 5 for the removal of ashes,cleaning out the rebox, 850.

Near the bottom of the front water-space a blow-off cock may beprovided.

The operation of the furnace is as follows: roo Fire having been startedand fuel supplied through door U, this door is left open the de sireddistance to admit sufficient air to properly support combustion, whilethe lower door, L, is kept closed to prevent the entrance of cold air.The air to support combustion, and the gases generated, pass downwardthrough the bed of incandescent fuel, thence around l the pendentpartition or water-table, under the boilers, and into the return-1i uesa, to the stack. The water from the boilers descends through bottomopenings, g, into the water-space in the frontwallsofthefurnace,passesthencethrough the tubular bars into the pendentpartition or water-table, through the pendent partition or water-tableinto the water-spaces E of the side walls of the furnace, and thencethrough the steam and Water openings hin the sides of the boiler,completing the circulation, as indicated by the arrows in the drawings.

Among the advantages of our invention are that, owing to thedirectiongiven to the circulation, the coldest of the boilerwateris brought inContact with the hottest heating-surface, and the accumulation ofsediment in the grate-bars and pendent partition or watentable isprevented.

The advantages of the special construction shown are, that itis readilyapplied to returntlue boilers ofthe ordinary or cylindrical form, iscompact, occupying little space, and the communications between theboilers and water-spaces of the furnace are readily made.

Having thus described our invention, what we claim, and desire to secureby Letters Patent, is-

1. The combination, with areturn-ilue boiler, of a tire-box; having thecontinuous front and side Water-spaces which communicate with the boilerby the openings in the shell thereof, a transverse pendent partition orwater-table which communicates with the side waterspaces, the spacebetween the boiler and pendent partition or water-table being closed toinsure a downward draft, and a series ot' tubular gratebars whichconnect the front water- .space and the pendent partition orwater-table, whereby a circulation from the boiler through the frontwater-space, grate, pendent partition or water-table, and sideWater-spaces is maintained, substantially as specified.

2. The combination, with the boilers A A, having return-fines a a andopenings g It, of a furnace having side water-spaces, E, the frontwater-space, the pendent partition or watertable F, the tubular grateGr, and the curved water-throat e, substantially as and for the purposespecified.

In testimony whereofwe atX our signatures, in presence of two witnesses,this 13th day ot' July, 1881.

MELVILLE C. HAWLEY.

MICHAEL KEARNEY.

Witnesses:

E. G. Onnnwrcm' E. D. KENNA.

